EP0610044B1 - Molded case circuit breaker modular line strap assembly - Google Patents
Molded case circuit breaker modular line strap assembly Download PDFInfo
- Publication number
- EP0610044B1 EP0610044B1 EP94300690A EP94300690A EP0610044B1 EP 0610044 B1 EP0610044 B1 EP 0610044B1 EP 94300690 A EP94300690 A EP 94300690A EP 94300690 A EP94300690 A EP 94300690A EP 0610044 B1 EP0610044 B1 EP 0610044B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- support plate
- strap assembly
- line strap
- brace
- circuit breaker
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/74—Means for adjusting the conditions under which the device will function to provide protection
- H01H71/7409—Interchangeable elements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
- H01H9/46—Means for extinguishing or preventing arc between current-carrying parts using arcing horns
Definitions
- the present invention relates to a line strap assembly for a molded case circuit breaker according to the preamble of claim 1.
- U.S. Patent 4,754,247 entitled “Molded Case Circuit Breaker Accessory Enclosure” describes a so-called “integrated” circuit breaker that provides both circuit interruption as well as accessory function.
- This Patent should be reviewed for its disclosure of an accessory cover mounted on the circuit breaker cover for providing access to field-installable accessory devices.
- the integrated circuit breaker includes an integrated circuit electronic trip unit which allows one circuit breaker design to be used over a wide range of ampere ratings in combination with a rating plug, also mounted in the circuit breaker cover.
- the electronic trip unit is described within U.S. Patent 4,589,052 and the rating plug is described within U.S. Patent 4,649,455.
- one purpose of the invention is to provide a circuit breaker line strap modular assembly whereby the line strap components are additively combined for each circuit breaker ampere rating.
- line strap assembly for a molded case circuit breaker comprising in combination: an electrically-conductive support plate having means at one end for receiving a line terminal connector; and an electrically-insulative plate having an aperture formed within one end and arranged on a top surface of the support plate; characterized by an arc runner having an offset formed at one end and an upturned tab formed at an opposite end thereof, the offset being arranged within the aperture and the tab being arranged over said insulative plate; and a brace attached to a bottom surface of the support plate providing additional support to the support plate.
- the brace may be U-shaped.
- An integrated circuit breaker 10 is shown in Figure 1 and consists of a molded plastic case 11 to which a molded plastic cover 12 is attached.
- An accessory cover 13 as described in the aforementioned U.S. Patent 4,754,247 is arranged on the top of the cover around the handle slot opening 14 through which the handle operator 15 extends.
- the rating plug 21 is also accessible from the circuit breaker cover to allow the ampere rating of the circuit breaker to be adjusted as described within aforementioned U.S. Patent 4,649,455.
- Electrical connection with an industrial power distribution circuit is made by means by the line terminal lugs 16 that are supported upon a line terminal inset 17 within the line terminal compartments 19 and attached to the threaded opening 35.
- a similar load terminal inset 18 is arranged at the load terminal end, as indicated.
- the line terminal strap 20 electrically connects with the circuit breaker current-carrying components as best seen by now referring to Figure 2.
- the circuit breaker 10 is depicted in Figure 2 with the cover removed to show the circuit breaker operating mechanism 22 which is better described in U.S. Patent 5,004,878 entitled "Molded Case Circuit Breaker Movable Contact Arm Arrangement".
- the circuit current transfers between the line terminal lugs 16 and line terminal straps 20 that are arranged within the line terminal compartments 19 at one end, through the fixed arcing contact 28.
- the fixed contacts transfer current to the movable arcing contacts 25 that are arranged on the movable arcing contact arms 24 and which connect with the load terminal straps 20A and load terminal lugs 16A arranged within the load terminal compartment 31.
- the operating mechanism Upon the occurrence of an overcurrent condition, the operating mechanism lifts the movable arcing contact arms 24 to rapidly separate the movable arcing contacts 25 from the fixed arcing contact 28, and thereby separate the circuit existing between the line and load terminal lugs.
- the current transfers from the fixed main contacts 29 to the fixed arcing contacts 28 and then to the associated arc runners 30.
- the arc that is generated during the contact separation is extinguished in the arc chutes 26 within the arc plates 27.
- the crossbar 23 interconnects each of the three movable arcing contact arms 24 to insure that the contact arms respond simultaneously within the operating mechanism 22.
- the line strap 20 is shown in Fig. 3 to consist of a basic support plate 32 of silver-plated copper stock which is formed to an off-set end 34 to which the fixed main contacts 29 of a silver alloy are attached.
- the lanced upper part 33 supports the fixed arcing contact 28 also formed from a silver alloy.
- a thru-hole 44 formed in the support plate locates both the arc runner 30 and the high temperature plastic insulating plate 37 on the support plate 32.
- the off-set end 41 is sized to fit within the rectangular slot 38 and is attached to the support plate 32 by insertion of the screw 52 through the thru-hole 42 in the offset end 41 through the thru-hole 44 and into the threaded opening 45 of the support 43 to trap the plastic plate 37 between the arc runner 30 and the support plate 32.
- the upstanding tab 40 at the end of the arc runner is operationally positioned at one end of the plastic plate 37 and the tongue 39 extending from the opposite end is operationally positioned between the fixed main contacts 29. Since the thickness of the support plate 32 is reduced to approximately fifty percent of the prior art line strap thickness, additional strength must be provided to compensate for the corresponding reduction in the mass of material.
- This support is in the form of a U-shaped support brace 43 formed from a metal plate to define a pair of downwardly depending tabs or legs 46, the bottom of which are co-extensive with the bottom of the off-set end 34 of the support plate 32.
- the threaded opening 45 formed in the support brace is aligned with the thru-holes 42,44 to receive the attachment screw 52.
- the line strap 20 (depicted in Figure 2) includes the fixed arcing contact 28 and fixed main contacts 29.
- a conductive plate 47 consisting of silver-plated copper is attached to a bottom part thereof in place of the U-shaped support brace, described earlier.
- the conductive plate includes an opening 53 oversized to receive the collar 36 extending from the bottom of the thru-hole 35 formed in the line strap support plate 32.
- the conductive plate 47 is attached to the support plate 32 by welding or brazing.
- the conductive plate can also be attached by means of thru-holes 48 in the conductive plate, threaded openings 50 in the support plate and screws 51 to form the higher current line strap 20' shown in Figure 5.
- the screw 52 passes though the thru-hole 42 in the arc runner 30, the thru-hole 44 in the support plate 32 and the threaded opening 49 in the conductive plate 47 to provide further attachment between the conductive plate 47 and the support plate 32.
- the attachment of the conductive plate increases the mass of the line strap such that the support brace 43 of Figure 3 is no longer required.
- a modular line strap assembly having both high and low current capability has herein been described.
- the arrangement of an additive conductive plate allows higher currents to transfer without adverse heating while the absence of the conductive plate allows lower currents without over-heating and at a substantial cost savings.
Landscapes
- Breakers (AREA)
Description
- The present invention relates to a line strap assembly for a molded case circuit breaker according to the preamble of claim 1.
- U.S. Patent 4,754,247 entitled "Molded Case Circuit Breaker Accessory Enclosure" describes a so-called "integrated" circuit breaker that provides both circuit interruption as well as accessory function. This Patent should be reviewed for its disclosure of an accessory cover mounted on the circuit breaker cover for providing access to field-installable accessory devices. The integrated circuit breaker includes an integrated circuit electronic trip unit which allows one circuit breaker design to be used over a wide range of ampere ratings in combination with a rating plug, also mounted in the circuit breaker cover. The electronic trip unit is described within U.S. Patent 4,589,052 and the rating plug is described within U.S. Patent 4,649,455.
- The use of common circuit breaker components over a wide variety of ampere ratings could provide a strain on the circuit breaker case in the vicinity of the line and load terminal straps upon short circuit interruption when operated at high ampere loadings. The large electrodynamic forces exerted between adjacent line terminal straps and between adjacent load terminal straps exert corresponding large stress forces to the underlying case to which the line and load terminal straps are secured. U.S. Patent 4,975,667 describes a glass-filled plastic inset that provides added strength to the line and load terminal straps to thereby allow common circuit breaker components to be used over a wider range of circuit breaker ampere ratings without adding to the circuit breaker cost.
- US 4086460, on which the preamble of claim 1 is based, also shows a form of improved line strap construction.
- The increase in the cost of the copper and silver materials used to fabricate the line strap components is reflected in the overall circuit breaker component costs. To reduce the number of components that must be inventoried, a large line strap that is designed for a 1600 ampere circuit breaker is also used within an 800 ampere circuit breaker. Since the remaining components are common within both circuit breaker designs, it would be cost beneficial to provide a line strap design that can be assembled from common lower current components and additively assemble the components to accommodate for the hig her current rating.
- Accordingly, one purpose of the invention is to provide a circuit breaker line strap modular assembly whereby the line strap components are additively combined for each circuit breaker ampere rating.
- According to the invention, there is provided line strap assembly for a molded case circuit breaker comprising in combination: an electrically-conductive support plate having means at one end for receiving a line terminal connector; and an electrically-insulative plate having an aperture formed within one end and arranged on a top surface of the support plate; characterized by an arc runner having an offset formed at one end and an upturned tab formed at an opposite end thereof, the offset being arranged within the aperture and the tab being arranged over said insulative plate; and a brace attached to a bottom surface of the support plate providing additional support to the support plate. The brace may be U-shaped.
- The invention will now be described in greater detail, by way of example, with reference to the drawings in which:
- Figure 1 is a top perspective view of a molded case circuit breaker employing the line strap assembly in accordance with an embodiment of the invention;
- Figure 2 is a top perspective view of the circuit breaker of Figure 1 with the cover removed to depict the line strap assembly contained therein;
- Figure 3 is an enlarged top perspective view of the components of the line strap assembly of Figure 2 in isometric projection;
- Figure 4 is a side view of the line strap assembly of Figure 3 prior to attaching a high current-carrying component; and
- Figure 5 is a side view of the line strap assembly of Figure 3 with the high current-carrying component attached.
-
- An integrated
circuit breaker 10 is shown in Figure 1 and consists of a moldedplastic case 11 to which a moldedplastic cover 12 is attached. Anaccessory cover 13 as described in the aforementioned U.S. Patent 4,754,247 is arranged on the top of the cover around the handle slot opening 14 through which thehandle operator 15 extends. Therating plug 21 is also accessible from the circuit breaker cover to allow the ampere rating of the circuit breaker to be adjusted as described within aforementioned U.S. Patent 4,649,455. Electrical connection with an industrial power distribution circuit is made by means by theline terminal lugs 16 that are supported upon aline terminal inset 17 within theline terminal compartments 19 and attached to the threadedopening 35. A similarload terminal inset 18 is arranged at the load terminal end, as indicated. Theline terminal strap 20 electrically connects with the circuit breaker current-carrying components as best seen by now referring to Figure 2. - The
circuit breaker 10 is depicted in Figure 2 with the cover removed to show the circuitbreaker operating mechanism 22 which is better described in U.S. Patent 5,004,878 entitled "Molded Case Circuit Breaker Movable Contact Arm Arrangement". The circuit current transfers between theline terminal lugs 16 andline terminal straps 20 that are arranged within theline terminal compartments 19 at one end, through the fixedarcing contact 28. The fixed contacts transfer current to themovable arcing contacts 25 that are arranged on the movable arcingcontact arms 24 and which connect with theload terminal straps 20A andload terminal lugs 16A arranged within theload terminal compartment 31. Upon the occurrence of an overcurrent condition, the operating mechanism lifts the movable arcingcontact arms 24 to rapidly separate themovable arcing contacts 25 from the fixedarcing contact 28, and thereby separate the circuit existing between the line and load terminal lugs. The current transfers from the fixedmain contacts 29 to the fixedarcing contacts 28 and then to the associatedarc runners 30. The arc that is generated during the contact separation is extinguished in thearc chutes 26 within thearc plates 27. Thecrossbar 23 interconnects each of the three movable arcingcontact arms 24 to insure that the contact arms respond simultaneously within theoperating mechanism 22. - In accordance with the invention, the
line strap 20 is shown in Fig. 3 to consist of abasic support plate 32 of silver-plated copper stock which is formed to an off-setend 34 to which the fixedmain contacts 29 of a silver alloy are attached. The lancedupper part 33 supports the fixed arcingcontact 28 also formed from a silver alloy. A thru-hole 44 formed in the support plate locates both thearc runner 30 and the high temperature plasticinsulating plate 37 on thesupport plate 32. The off-set end 41 is sized to fit within therectangular slot 38 and is attached to thesupport plate 32 by insertion of thescrew 52 through the thru-hole 42 in theoffset end 41 through the thru-hole 44 and into the threadedopening 45 of thesupport 43 to trap theplastic plate 37 between thearc runner 30 and thesupport plate 32. With the arc runner attached to the support plate, theupstanding tab 40 at the end of the arc runner is operationally positioned at one end of theplastic plate 37 and the tongue 39 extending from the opposite end is operationally positioned between the fixedmain contacts 29. Since the thickness of thesupport plate 32 is reduced to approximately fifty percent of the prior art line strap thickness, additional strength must be provided to compensate for the corresponding reduction in the mass of material. This support is in the form of aU-shaped support brace 43 formed from a metal plate to define a pair of downwardly depending tabs orlegs 46, the bottom of which are co-extensive with the bottom of the off-set end 34 of thesupport plate 32. The threadedopening 45 formed in the support brace is aligned with the thru-holes attachment screw 52. The line strap 20 (depicted in Figure 2) includes the fixedarcing contact 28 and fixedmain contacts 29. - When the
line strap 20 shown assembled in Figure 4 is to be used within a higher rated circuit breaker assembly, aconductive plate 47 consisting of silver-plated copper is attached to a bottom part thereof in place of the U-shaped support brace, described earlier. The conductive plate includes anopening 53 oversized to receive thecollar 36 extending from the bottom of the thru-hole 35 formed in the linestrap support plate 32. Theconductive plate 47 is attached to thesupport plate 32 by welding or brazing. The conductive plate can also be attached by means of thru-holes 48 in the conductive plate, threadedopenings 50 in the support plate andscrews 51 to form the higher current line strap 20' shown in Figure 5. Thescrew 52 passes though the thru-hole 42 in thearc runner 30, the thru-hole 44 in thesupport plate 32 and the threadedopening 49 in theconductive plate 47 to provide further attachment between theconductive plate 47 and thesupport plate 32. The attachment of the conductive plate increases the mass of the line strap such that thesupport brace 43 of Figure 3 is no longer required. - A modular line strap assembly having both high and low current capability has herein been described. The arrangement of an additive conductive plate allows higher currents to transfer without adverse heating while the absence of the conductive plate allows lower currents without over-heating and at a substantial cost savings.
Claims (11)
- Line strap assembly for a molded case circuit breaker comprising in combination:an electrically-conductive support plate (32) having means at one end for receiving a line terminal connector (29); andan electrically-insulative plate (37) having an aperture (38) formed within one end and arranged on a top surface of the support plate (32); and characterised byan arc runner (30) having an off-set (41) formed at one end and an upturned tab (40) formed at an opposite end thereof, the off-set (41) being arranged within the aperture (38) and the tab (40) being arranged over said insulative plate (37); anda brace (43,47) attached to a bottom surface of the support plate (32) providing additional support to the support plate (32).
- The line strap assembly of claim 1, wherein the brace (43) is U-shaped.
- The line strap assembly of claim 1 or 2 characterised by a first aperture (42) formed within the offset (41), a second aperture (44) formed within the support plate (32) coextensive with the first aperture (42)and a third aperture (45) formed within the brace (43) co-extensive with the first and second apertures (42,44).
- The line strap assembly of claim 3 characterised by means (52) extending through the first, second and third apertures (42,44,45) to fasten the arc runner (30) to the support plate (32) and the brace (43) whereby the insulative plate (37) is trapped between the arc runner (30) and the support plate (32).
- The line strap assembly of any one of claims 1 to 4, characterised by a lanced part (33) formed on the support plate (32) supporting a fixed arcing contact (28).
- The line strap assembly of any preceding claim characterised by a pair of fixed main contacts (29) attached to the support plate (32).
- The line strap assembly of claim 6 characterised by a tongue (39) formed at one end of the insulating plate (37) and arranged intermediate the main contacts (29).
- The line strap assembly of claim 3 or any claim directly or indirectly appendant thereto characterised in that the third aperture (45) comprises a threaded opening.
- The line strap assembly of any preceding claim characterised in that the brace (47) comprises a conductive plate.
- The line strap assembly of claim 9 characterised in that the brace (47) is welded or brazed to the support plate (32).
- The line strap assembly of any preceding claim characterised in that the support plate (32) has an offset (34) at one end and the brace (43) has a pair of depending tabs (46), the bottom of which tabs (46) are coextensive with the bottom of the support plate offset (34).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11816 | 1993-02-01 | ||
US08/011,816 US5323130A (en) | 1993-02-01 | 1993-02-01 | Molded case circuit breaker modular line strap assembly |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0610044A1 EP0610044A1 (en) | 1994-08-10 |
EP0610044B1 true EP0610044B1 (en) | 2000-08-02 |
Family
ID=21752092
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94300690A Expired - Lifetime EP0610044B1 (en) | 1993-02-01 | 1994-01-31 | Molded case circuit breaker modular line strap assembly |
Country Status (3)
Country | Link |
---|---|
US (1) | US5323130A (en) |
EP (1) | EP0610044B1 (en) |
DE (1) | DE69425387T2 (en) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5479059A (en) * | 1993-08-23 | 1995-12-26 | United Technologies Corporation | Thin film superconductor magnetic bearings |
US6384702B1 (en) * | 1998-09-30 | 2002-05-07 | Rockwell Automation Technologies, Inc. | Stationary contact for an electrical contactor and method for conducting current through same |
US6912443B2 (en) | 2000-03-10 | 2005-06-28 | David W. Duemler | Modular automated assembly system |
US6535786B1 (en) | 2000-03-10 | 2003-03-18 | David W. Duemler | Modular automated assembly system |
US6437670B1 (en) * | 2002-02-12 | 2002-08-20 | General Electric Company | Magnetic release system for a circuit breaker |
US7716816B2 (en) | 2006-09-22 | 2010-05-18 | Rockwell Automation Technologies, Inc. | Method of manufacturing a switch assembly |
US7551050B2 (en) * | 2006-09-22 | 2009-06-23 | Rockwell Automation Technologies, Inc. | Contactor assembly with arc steering system |
US7863537B2 (en) * | 2007-10-09 | 2011-01-04 | Eaton Corporation | Gassing insulator assembly, and conductor assembly and electrical switching apparatus employing the same |
DE102011003598B4 (en) | 2011-02-03 | 2023-02-02 | Siemens Aktiengesellschaft | Electronic trip unit for an electric switch |
US8759697B2 (en) | 2011-10-12 | 2014-06-24 | Schneider Electric USA, Inc. | Molded case circuit breaker capable of withstanding short circuit conditions |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE7402766U (en) * | 1974-01-28 | 1976-05-02 | Bbc Ag | Electrical connection rail for switching devices |
US4086460A (en) * | 1977-03-17 | 1978-04-25 | General Electric Company | Circuit breaker having improved line strap construction |
US4589052A (en) * | 1984-07-17 | 1986-05-13 | General Electric Company | Digital I2 T pickup, time bands and timing control circuits for static trip circuit breakers |
US4649455A (en) * | 1986-04-28 | 1987-03-10 | General Electric Company | Rating plug for molded case circuit breaker |
US4754247A (en) * | 1987-06-12 | 1988-06-28 | General Electric Company | Molded case circuit breaker accessory enclosure |
US5004878A (en) * | 1989-03-30 | 1991-04-02 | General Electric Company | Molded case circuit breaker movable contact arm arrangement |
US4975667A (en) * | 1989-08-30 | 1990-12-04 | General Electric Company | Molded case circuit breaker with increased ampere rating |
US5172088A (en) * | 1992-02-06 | 1992-12-15 | General Electric Company | Molded case circuit breaker combined accessory actuator-reset lever |
-
1993
- 1993-02-01 US US08/011,816 patent/US5323130A/en not_active Expired - Fee Related
-
1994
- 1994-01-31 DE DE69425387T patent/DE69425387T2/en not_active Expired - Fee Related
- 1994-01-31 EP EP94300690A patent/EP0610044B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
US5323130A (en) | 1994-06-21 |
DE69425387T2 (en) | 2001-03-29 |
DE69425387D1 (en) | 2000-09-07 |
EP0610044A1 (en) | 1994-08-10 |
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